Re: HAL Input gain
Re: HAL Input gain
- Subject: Re: HAL Input gain
- From: Michael Thornburgh <email@hidden>
- Date: Wed, 13 Nov 2002 12:33:47 -0800
not all imics have gain controls visible to the HAL. in particular,
the older ones do not. i just purchased some brand new imics a few
weeks ago and was surprised that they _did_ have (HAL) input gain
controls.
-mike
On Wednesday, November 13, 2002, at 12:20 PM, Jeff Moore wrote:
It is supposed to not be possible for a HAL device to implement
kAudioDevicePropertyVolumeScalar but not
kAudioDevicePropertyVolumeDecibels and friends. The HAL's
representation of the volume control is it's own, so if one is there,
the others ought to be.
Something very strange is happening. Does this iMic work correctly on
other machines?
On Wednesday, November 13, 2002, at 12:42 AM, Martin Hairer wrote:
Hi,
I am using the
kAudioDevicePropertyVolumeRangeDecibels
kAudioDevicePropertyVolumeDecibels
selectors to adjust input gain. It seems that on one of my tester's
machine, this doesn't
work for the iMic. Is it possible (I know it's possible in theory but
I mean in real-world)
that a driver (more specifically the USB Audio driver) implements
kAudioDevicePropertyVolumeScalar
but doesn't implement the above selectors? I would have thought that
if a driver accepts to
change its gain, it should accept it in both dB and absolute
values... If not, is there a "default"
dB range to display to the user? Thanks,
Martin
HairerSoft
http://www.hairersoft.com/
--
Jeff Moore
Core Audio
Apple
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